scholarly journals Stress in the Mandible with Splinted Dental Implants caused by Limited Flexure on Mouth Opening: An in vitro Study

2012 ◽  
Vol 1 (1) ◽  
pp. 8-13 ◽  
Author(s):  
Balázs Erdohelyi ◽  
Péter István Szabó ◽  
Endre Varga
Keyword(s):  
Dental Implants ◽  
High Stress ◽  
Mouth Opening ◽  
Great Distance ◽  
Three Dimensional Model ◽  
Partial Denture ◽  
Second Molar ◽  
Fixed Partial Denture ◽  
Edentulous Mandible

ABSTRACT Aim The aim of this study was to evaluate the stress developed in the bar connecting implants and in the mandible as a result of the elastic deformation of the mandible during mouth opening when using a finite element method (FEM). Materials and methods A three-dimensional model of an edentulous mandible was generated based on the computer tomography (CT) data of a patient. Two cylindrical implants (diameter 4.3 mm, length 13 mm) were inserted in the area of the mandibular canine, premolar and molar in the mandibular model. Implants were connected with a rigid bar (width 2 mm, height 3 mm), and mouth opening was simulated on the threedimensional (3D) model. The location and magnitude of maximum von Misess stress that occurred in the mandible and in the bar were estimated. Results The highest stress level in the mandible (4.5 GPa) and in the splint (32 GPa) was measured in the longest fixed partial denture with the implants in the mandibular left canine and left second molar position. The maximum stress in the bone was measured distal to the splinted implants. Conclusion Since, great distance between splinted implants caused high stress during mouth opening, due to mandibular deformation, the use of a short span fixed partial denture supported by implants in the molar region of the edentulous mandible is probably more advantageous. How to cite this article Radnai M, Erdohelyi B, Szabó PI, Varga E. Stress in the Mandible with Splinted Dental Implants caused by Limited Flexure on Mouth Opening: An in vitro Study. Int J Exper Dent Sci, 2012;1(1):8-13.

scholarly journals In Vitro Assessment of the Effect of Implant Position on Biomechanical Behaviors of Implant-Supported Removable Partial Dentures in Kennedy Class II Condition

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2145
Author(s):  
Masafumi Kihara ◽  
Yoichiro Ogino ◽  
Yasuyuki Matsushita ◽  
Takehiro Morita ◽  
Yoshinori Sawae ◽  
...  
Keyword(s):  
Bending Moment ◽  
Acrylic Resin ◽  
Vertical Displacement ◽  
Removable Partial Denture ◽  
Partial Denture ◽  
Implant Position ◽  
Second Molar ◽  
Edentulous Mandible ◽  
In Vitro Assessment

The purpose of this study was to investigate the effects of implant position and loading position on biomechanical behaviors using implant-supported removable partial denture (ISRPD) models in a simulated Kennedy class Ⅱ partially edentulous mandible. Three types of Kennedy class Ⅱ mandibular acrylic resin models (a conventional RPD without support by an implant—CRPD; models with an implant placed at first molar (#46)—MP-ISRPD— and second molar (#47)—DP-ISRPD) were used to measure vertical displacement of the RPD, mesio-distal displacement of the abutment tooth, and bending moment of the abutment tooth and implant under one-point loading. The variables at three respective loading points (#45, #46 and #47) were compared statistically. Vertical displacement was suppressed in ISRPDs compared to the CRPD, and significant effects were identified under loading at the implant position. The largest meiso-distal displacement was observed in MP-ISRPD under #47 loading. Bending moments of the abutment tooth and implant were significantly higher in MP-ISRPD than in DP-ISPRD. In MP-ISRPD, a higher bending moment of the abutment tooth under #45 and #47 loading was detected, although the bending moment in DP-ISRPD was almost zero. The results of this study suggested that MP-ISRPD shows the specific biomechanical behaviors, although DP-ISRPD might provide biomechanical benefits under all one-point loading conditions.

scholarly journals Multivariate analysis of the influence of peri-implant clinical parameters and local factors on radiographic bone loss in the posterior maxilla: a retrospective study on 277 dental implants

2020 ◽  
Author(s):  
Mariane B. Sordi ◽  
Vittoria Perrotti ◽  
Flavia Iaculli ◽  
Keila C. R. Pereira ◽  
Ricardo S. Magini ◽  
...  
Keyword(s):  
Logistic Regression ◽  
Multivariate Analysis ◽  
Bone Loss ◽  
Dental Implants ◽  
Clinical Parameters ◽  
Partial Denture ◽  
Local Factors ◽  
Fixed Partial Denture ◽  
Single Crown ◽  
Posterior Maxilla

Abstract Objectives The aim of the present study was to investigate whether peri-implant clinical parameters (modified plaque index (mPI), bleeding and/or suppuration on probing (B/SOP)) and local factors (type of prostheses, screw emergence, platform diameter, and abutment angulation) might contribute to the development of additional bone loss and peri-implantitis around dental implants. Materials and methods Two hundred seventy-seven external hex connection implants placed in the posterior maxilla of 124 patients were retrospectively evaluated. They were divided into two groups: physiologic bone loss < 2 mm (PBL) or additional bone loss ≥ 2 mm (ABL). GEE logistic regression was applied to evaluate the influence of type of prostheses (implant-supported single crown (ISSC), fixed partial denture (ISFPD), and full denture (ISFD)) and clinical parameters (mPI and S/BOP) on bone loss. Results Among the 277 implants, 159 (57.4%) presented PBL and 118 (42.6%) presented ABL. Within the ABL group, 20.6% implants were diagnosed with peri-implantitis. mPI significantly correlated with the type of prosthesis and the highest value of mPI (index = 3) was observed in ISFD (23.8%). Moreover, peri-implantitis was more frequently associated with ISFD (32.79%) than ISSC and ISFDP (13.79% and 13.48, respectively) Conclusions ISFD in the posterior maxilla presented high rates of ABL and showed a higher prevalence of peri-implantitis. None of the local factors seemed to contribute to the development of these conditions. Further investigations are needed to prospectively support the results of the present study. Clinical relevance Patients rehabilitated with ISFD should be carefully monitored and have more frequent maintenance visits to prevent or control peri-implant bone loss.

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